Tool, A Perfect Circle, Deftones, Rob Zombie (Hellbilly Deluxe), anything Metallica, and my personal favorite Slipknot (tenRAB to cause me to get tickets)
songs that make it feel like summer with the windows down:
Led Zeppelin - The Song Remains The Same, Over The Hills & Far Away, Rock & Roll...
lots of stuff by The Doobie Brothers
Soundgarden - Burden In My Hand
Book of Love, either their self titled disc or Lullaby.
They both have a great flow to them, but then, it depenRAB on the kind of driving you are doing. My suggestion is based on hills meshed with sweeping corners. None 'o' that straight and flat stuff for me.
play anything you like, and play it really really loud, i saw in some mag that it has something to do w/ this one part in your ear vibrating and its association w/ pleasure going through your brain waves.....sort of like and arenaline aphrodesiac thing i guess